<template>
    <div class="app-container">
        <mt-header fixed title="第一个Vue项目">
            <span to="/" slot="left">
                <mt-button icon="back" @click="back" v-show="flag">返回</mt-button>
            </span>
        </mt-header>
        
        <!-- 路由的容器坑 -->
		<transition>
        	<router-view></router-view>
		</transition>

        <!-- tabbar区域 -->
        <nav class="mui-bar mui-bar-tab">
			<router-link class="my-tab-item" to="/home">
				<span class="mui-icon mui-icon-home"></span>
				<span class="mui-tab-label">首页</span>
			</router-link>
			<router-link class="my-tab-item" to="/member">
				<span class="mui-icon mui-icon-contact"></span>
				<span class="mui-tab-label">会员</span>
			</router-link>
			<router-link class="my-tab-item" to="/shopcar">
				<span class="mui-icon mui-icon-extra mui-icon-extra-cart"><span class="mui-badge" id="badge"> {{totalcount}} </span></span>
				<span class="mui-tab-label">购物车</span>
			</router-link>
			<router-link class="my-tab-item" to="/search">
				<span class="mui-icon mui-icon-search"></span>
				<span class="mui-tab-label">搜索</span>
			</router-link>
		</nav>
    </div>
</template>

<script>
import { mapGetters } from 'vuex';
export default {
    data(){
		return{
			flag:true
		}
	},
	methods:{
		back(){
			history.go(-1);
		}
	},
	created(){
		if(this.$route.path === '/home'){
			this.flag = false;
		} else{
			this.flag = true
		}
	},
	watch:{
		'$route.path':function(newVal,oldVal){
			if(newVal === '/home'){
				this.flag = false;
			} else{
				this.flag = true
			}
		}
	},
	computed:{
		...mapGetters(["totalcount"])
	}
}
</script>

// 这里写的样式要符合SCSS语法，并且样式是当前组件私有的，不会成为全局的样式，也不会应用于子组件
<style lang="scss" scoped>
    .app-container{
        padding-top: 40px;
		padding-bottom: 50px;
		//当有组件切换动效的时候，一瞬间页面的宽度会变成正常宽度的两倍，此时，需要隐藏超出屏幕宽度的区域
		overflow: hidden;
    }

	//动画效果的相关样式
	.v-enter{
		opacity: 0;
		//让即将进入的页面，向右偏移100%屏幕的宽度
		transform: translateX(100%);
	}

	.v-leave-to{
		opacity: 0;
		//让即将进入的页面，向右偏移100%屏幕的宽度
		transform: translateX(-100%);
		position: absolute;
	}

	.v-enter-active,
	.v-leave-active{
		transition: all 0.4s ease;
	}

	.mint-header{
		z-index: 99;
	}

	.mui-bar-tab .my-tab-item.mui-active {
   		color: #007aff;
	}
	.mui-bar-tab .my-tab-item {
    	display: table-cell;
    	overflow: hidden;
    	width: 1%;
    	height: 50px;
    	text-align: center;
    	vertical-align: middle;
   		white-space: nowrap;
    	text-overflow: ellipsis;
    	color: #929292;
	}
	.mui-bar-tab .my-tab-item .mui-icon {
    	top: 3px;
    	width: 24px;
    	height: 24px;
   		padding-top: 0;
    	padding-bottom: 0;
	}
	.mui-bar-tab .my-tab-item .mui-icon~.mui-tab-label {
    	font-size: 11px;
    	display: block;
    	overflow: hidden;
    	text-overflow: ellipsis;
	}
</style>